Full Duplex Antenna Study
Technical Report,01 May 2017,28 Feb 2018
University of Colorado - Boulder Boulder United States
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One of the most difficult challenges for RF electronics is achieving a co-channel isolation 100dB for simultaneous transmit and receive STAR from a single aperture without any time frequency polarization beam-pointing multiplexing. For narrow bandwidth channels and transmitted powers in hundreds of watts the isolation must be 130dB. To achieve gold-STAR capability, the new front-end topologies that combine multiple layers of analog isolation and digital back-end processing are needed. A carefully designed passive antenna subsystem may provide 20-80dB of gold-STAR isolation thus significantly aiding the actual implementation of full duplex RF systems, and then reducing cost. The objective of this project was to conduct detailed study of antenna configurations that may yield high gold-STAR self-interference cancellation for a general set of applications of interest for the US Army. To allow some degree of realism and practical relevance for the conducted research, we considered applications such as 1 high-gain point-to-point microwave links, 2 UAS communications, and3 handheld radios. The study identified the fundamental and practical challenges, paths for mitigation thereof, tradeoffs, and most importantly antenna configurations that maximize self-interference cancellation with little to no degradation in their performance. Accomplishments In this research, different design approaches for achieving monostatic STAR antenna functionality on platforms of interest for US Army are investigated. Theoretical and computational studies are conducted to bridge the gap between the proposed technical approaches and the fundamental antenna theory. Based on the herein developed systematic antennaarray design approach, several antenna and array prototypes are built and theoretical findings are fully validated with experiments.
- Electrical and Electronic Equipment